患者男 ,5 7岁。近 1个月来无明显诱因下反复咳嗽 ,咳痰 ,红色黏稠 ,3个月前有两次咳痰夹血丝。查胸片考虑心包囊肿可能性大 ,纵隔肿瘤不能除外。入院时体温、脉搏、血压、呼吸 ,各项血液检查均正常。术前Ｂ超探测右乳头与右胸骨缘之间可见一个 92ｍｍ× 77ｍｍ的液性暗区 ,边 Male patient, 5 7 years old. In the past 1 month, there has been no obvious incentive for repeated coughing, coughing, and red stickiness. There were two coughs with bloodshot cyanosis three months ago. Chest radiographs are more likely to consider pericardial cysts than mediastinal tumors. On admission, body temperature, pulse, blood pressure, and respiration were normal. A 92mm×77mm liquid dark area can be seen between the right nipple and the right sternal border by preoperative B-ultrasound detection.